(1) The layoff units included under this policy are as follows:

(2) Additional layoff units may be included under this policy at the discretion of the district president. Seniority lists of tenured and probationary faculty will be developed and published and/or posted by the district president and will be updated within five working days of November 1 of each year. Tenured and probationary academic employees shall be placed in the layoff unit which best reflects their training and ability as determined by the district president.